NTT SUSI Deep Field

This colour image shows objects as faint as 26th magnitude and it illustrates well the performance in deep imaging at good angular resolution with a relatively modest investment in exposure time at a 4m-class ground-based telescope. Of the approximately 500 galaxies detected in this field, the largest fraction are expected to be at redshifts smaller than z = 1 and about 20 percent to have higher redshifts, up to z = 4 and possibly beyond. During this project, a total of 122 CCD frames were obtained in four colours [blue (B), green-yellow (V), red (r) and near-infrared (i-band)] with a total exposure time of no less than 31.5 hours. Total exposure times of 50400, 23400, 23400, 16200 seconds were obtained in the four bands, respectively. The frames cover a 2.3 x 2.3 arcmin 'empty sky' field centered south of the high-redshift quasar QSO BR 1202-0725 (z = 4.7), located just south of the celestial equator. These frames have been combined to produce a 'true' colour image in the sense that 'blue', 'green' and 'red' represent the B-, V- and (r+i)-frames, respectively. This version of the combined image has a lower contrast and brings forward structural details in the brighter objects in the field.

Crédit:

ESO

À propos de l'image

Identification:eso9801b
Type:Observation
Date de publication:13 janvier 1998
Communiqués de presse en rapport:eso9801
Taille:1110 x 1042 px

À propos de l'objet

Nom:NTT Susi Deep Field
Type:Early Universe : Galaxy : Grouping : Cluster
Distance:z=4.0 (redshift)
Constellation:Virgo
Catégorie:Galaxy Clusters

Formats des images

Grand JPEG
301,7 Kio
JPEG taille écran
183,6 Kio

Fonds d'écran

1024x768
206,1 Kio
1280x1024
317,3 Kio
1600x1200
414,0 Kio
1920x1200
447,6 Kio
2048x1536
586,5 Kio

Coordinates

Position (RA):12 5 22.50
Position (Dec):-7° 44' 9.92"
Field of view:2.38 x 2.24 arcminutes
Orientation:North is 89.4° right of vertical